York. A system of working coal. First, the main levels are started on both
sides of the shaft and carried toward the boundary. Second, the bord gates are
worked in pairs to the rise and continued as far as the boundary, or to within
a short distance of a range of upper levels and other bord gates. Lastly, the
whole of the pillars and remaining coal are worked out downhill to within a few
yards of the levels, and ultimately, all the coal between the levels is
removed. Fay
Source: Dictionary of Mining, Mineral, and Related Terms
Source:
Dictionary of Mining, Mineral, and Related Terms
